C the data are 5 times of 1, 2, 3, 4 and 5 respectively, and the variance is 200 times of 1, 2, 3, 4 and 5 100.

D, the data is 2 times 1, 2,3,4,5 times 1, and the variance is 4 times 1, 2,3,4,5, that is 16.

(3). The average value is 3 and the variance is 8/3.